Gravity Zero: If you have no shields and no other [Gabriella, HolyPrincess] in your battle zone you may summon this creature withoutcost.Double BreakerWhen your opponent would win the game by attacking with one of theircreatures, you may destroy this creature. If you do, your opponentdoesn't win the game, and your opponent's creatures can't attack thisturn. At the end of your next turn you lose the game.